Space maintaining device



FIG. 1 is a perspective top view of a space maintaining device showing my design;

FIG. 2 is a front side elevation view with the rear side elevation view being a mirror image thereof;

FIG. 3 is a left side elevation view with the right side elevation view being a mirror image thereof;

FIG. 4 is a top side plan view thereof; and,

FIG. 5 is bottom side plan view. 

CLAIM The ornamental design for a space maintaining device, as shown and described. 